Portable machine for shearing steel rods, wire ropes, and the like



Ju y 5, 1961 KAzuNosuKE NAlTO 2 993,275

PORTABLE MACHINE FOR SHEARING STEEL RODS, WIRE ROPES. AND THE LIKE FiledDec. 15, 1959 INVENTOR KAZUNOSUKE NAITO A'ITORNEY United States Patent2,993,275 PORTABLE MACHINE FOR SHEARIN G STEEL RODS, WIR'E ROPES, ANDTHE LIKE Kazunosuke Naito, 1'5 Z-Chome Fukagawa, Toyo cho, Koto-ku,Tokyo, Japan Filed Dec. '15, 1959, Ser. No. 859,811 Claims priority,application Japan Dec. 29, 1958 2 Claims. (Cl. '30--250) This inventionrelates to a simple portable machine for shearing steel rods, wireropes, and the like. More particularly the invention relates to aportable machine for shearing steel rods, Wire ropes, and the like whichis constituted as follows: A pair of disk-shaped cutters each of whichhas a U-shaped cutter in the periphery thereof are pivoted together. Ina long arm extending from one of the aforesaid cutters, two round shaftsare provided in parallel as to be freely rotatable. A gear and a ratchetwheel with a pawl in engagement therewith are secured to one of theaforesaid round shafts, which is further provided with a reciprocatinglyrotatable hand lever and a freely mounted guide drum. To the other ofthese shafts, there are fixed a gear in engagement with theabovementioned gear and a sprocket wheel. A chain, which one end hasbeen secured to a short hand lever extending from the other of theaforesaid pair of disk-shaped cutters, is after engagement with theaforesaid sprocket wheel guided by the aforesaid guide drum and thencoupled at its other end with one end of a coiled spring whose other endis secured to the other end of the long arm.

An object of this invention is to provide a portable machine forshearing steel rods, wire ropes, and the like which makes possible toshear easily by means of human power the foregoing articles.

Another object of the invention is to provide a portable machine forshearing steel rods, Wire ropes, and the like which operation can beperformed with simplicity and ease.

A still another object of the invention is to provide a portable machinefor shearing steel rods, wire ropes, and the like which construction notonly is very simple but also by virtue of its unique construction can bemade durable as well as compact in its over-all size. Further objectsand advantages of my invention will appear from the detaileddescription.

FIGURE 1 is a side view with a partial section of a portable machineembodying my invention and the chain lines show its movement.

FIGURE 2 is a plan view with a partial section of the portable machineof FIGURE 1.

FIGURE 3 is a view taken along line X--X of FIG- URE 2 showing a sectionas seen in the direction of the arrow.

The following is an explanation of the drawings: The disk-shaped cutter1 has in its periphery a U-shaped groove 1A whose one edge onlyconstitutes the cutting blade. The disk-shaped cutter 2 is similarlyproivded with a U-shaped groove 2A in its periphery, and these twodiskshaped cutters 1 and 2 are superposed with the central parts thereofpivoted with a shaft 3. From arms 1B and 2B of the disk-shaped cutters 1and 2 extend respectively in one body therewith a short hand lever 4 anda long hand lever 5, being secured thereto with rivets 6 and 7,respectively. The long hand lever is constituted as a hollow body, andin its forward part the round shafts 8 and 9 are pivotally supported asto be freely rotatable. At both ends of the round shaft 9 at the outersides of the long hand lever 5 there are fixed respectively a gear 10and a ratchet wheel 11. There is also freely mounted within the interiorof the long hand lever 5 a guide drum 12. And further, to the roundshaft 9 there is freely mounted a reciprocating hand lever 13 with afork 14 at its tip encompassing the aforesaid Patented July 25, 1961ratchet wheel 11. As shown in detail in FIGURE 3, a rocking piece 15 ispivoted with a pin 16. One end of this rocking piece 15 is formed into apawl 17 which engages teeth 11A of the ratchet wheel 11, while the otherend forms a simple protrusion, and in the middle, a projection 19 isprovided. A sliding stop 20 provided in a small hole in the end part ofthe reciprocating hand lever 13 is urged by means of a spring 21 againsteither the left or right shoulder located to the sides of the projection19. To the aforesaid round shaft 8 at its one end there is fixed to theouter side of the long lever 5 a gear 22 which engages with aforesaidgear 10, and in the interior of the long hand lever 5 a sprocket wheel23 is fixed. 10 is the cover which encloses the gears 10 and 22. A chain25 coupled to the aforesaid short hand lever 4 with a pin 26 enters theinterior of lever 5 through a small opening 5A and then, as shown inFIGURE 1, engages with a sprocket wheel 23, and after being guided by aguide drum 12, is coupled at its other end 25A with one end of a coiledspring 27 whose other end is secured to an end plate 5B of the long handlever 5.

The method of using the portable machine for shearing steel rods, wireropes, and the like of this invention is as follows: The machine isfirst made to assume the position as shown in FIGURE 1, the wire ropeand the like to be sheared is then placed in the U-shaped grooves 1A and2A, and the reciprocating hand lever 13 is manually actuated with aback-and-forth motion. When this is done, as the lever 13 moves in thedirection of the arrowsince the pawl 17 is in engagement with one of theteeth 11A, the ratchet wheel 11 is rotated a little, and when the lever13 moves in the opposite direction, the ratchet wheel 11 is not rotatedsince the pawl 17 slides over the teeth 11A. Thus the ratchet wheel 11is made to rotate intermittently in one direction. This rotation is thentransmitted to the round shaft 8 through the gears 10 and 22 and rotatesthe sprocket wheel 23. Thus the short hand lever 4 is pulled by means ofthe chain 25 toward the position indicated by the chain line, wherebythe wire rope and the like is sheared. In this instance, the end 25A ofthe chain 25 being pulled by the coiled spring 27 moves to the position25B. In order to return the short hand lever 4 to its original position,first, the rocking piece 15 is manipulated to the position as indicatedby the chain line in FIGURE 3. When this is done, the pawl 17 disengageswith teeth 11A and the simple protrusion 18 rides the top of the teeth11A, and thus since the ratchet wheel 11 attains the state where it isfreely rotatable, the short hand lever 4 can be easily pulled back toits original position.

Thus the machine of this invention has the advantages of not only beingof very simple construction but also its manipulation is easy andsimple. Moreover, since its long hand lever 5 has been constituted as ahollow body, wherein have been enclosed the sprocket Wheel 23, the guidedrum 12, and the coiled spring 27, and to the outside thereof have beendisposed the gears 10 and 22, the ratchet wheel 11, and thereciprocating hand lever 13, it possesses the advantage that it can beconstructed sturdily as well as compact in its over-all size.

Having fully described a preferred embodiment of this invention, it willbe obvious that the same may be varied in detail without departing fromthe spirit of the invention as set forth in the appended claims.

What is claimed:

1. A portable machine for shearing steel rods, wire ropes and the like,which comprises a pair of disk-shaped cutters pivotally connectedtogether, each of said cutters having a U-shaped curve in the peripherythereof, an elongated hand lever attached to and extending from one ofsaid disk-shaped cutters, a pair of parallel shafts journaled in saidhand lever, a gear and ratchet fixed to one of said shafts, a guide drumand a reciprocating hand lever rotatably mounted on said last shaft,said reciprocating hand lever carrying a pawl attached to engage saidratchet, a sprocket wheel and a gear carried by the other of saidshafts, said last gear being in engagement with said first mentionedgear, a short lever attached to the other of said disk-shaped cutters, achain secured at one end of said short lever and extending into saidelongated hand lever around said drum and in engagement with saidsprocket and a spring secured to the other end of said chain andanchored to said elongated lever, said chain being adapted to apply ashearing force to said short lever in response to repeated actuations ofsaid reciprocating hand lever.

2. A portable machine for shearing steel rods, wire ropes, and the likeaccording to claim 1, wherein said elongated hand lever is a hollow bodyand said sprocket, guide drum and spring are enclosed therein and saidgears, ratchet and reciprocating hand lever are mounted outside thereof.

References Cited in the file of this patent UNITED STATES PATENTS2,915,822 Naito Dec. 8, 1959

